Question

Skin, body hair, cilia, eyelashes, the respiratory tract and the gastrointestinal tract are examples of ________.
Select one:
a. Physical barrier
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Answer 1

Answer:

physical barrier is the correct answer of the question

Answer 2

Answer:

Physical barrier

Explanation:

Three defence mechanisms are provided by the human immune system to ward off foreign invaders: physical and chemical barriers, nonspecific resistance, and selective resistance.

The physical and chemical barriers, which are regarded as innate immune functions, serve as the initial line of defence.

Skin, the gastrointestinal tract, the respiratory tract, the nasopharynx, cilia, eyelashes, and other body hair are examples of physical barriers.

Most invaders normally enter through wounds or by being injected, like through mosquito bites; very few germs can penetrate unbroken skin. In order to restore the protective barrier, skin wounds heal quickly.

While antimicrobial compounds in sweat can kill a lot of would-be invaders, a complex community of regular skin bacteria tends to keep out newcomers.

The presence of the concentrates mostly on the defence of the gut typical commensal microbiota is enormous and incredibly complicated. Invaders might not be able to colonise the intestine if there is a healthy population of commensal microorganisms there. If everything else fails, vomiting and diarrhoea may be used to quickly flush invaders out of the GI tract.

Chemical defences include cells that fight foreign cells and body cells carrying infectious agents, as well as antimicrobial proteins that hurt or eliminate invaders.

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